19842459 has 24 divisors (see below), whose sum is σ = 32746752. Its totient is φ = 10464480.

The previous prime is 19842443. The next prime is 19842463. The reversal of 19842459 is 95424891.

It is not a de Polignac number, because 19842459 - 2⁴ = 19842443 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19842459.

It is not an unprimeable number, because it can be changed into a prime (19842499) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 754 + ... + 6344.

It is an arithmetic number, because the mean of its divisors is an integer number (1364448).

Almost surely, 2^19842459 is an apocalyptic number.

19842459 is a deficient number, since it is larger than the sum of its proper divisors (12904293).

19842459 is a wasteful number, since it uses less digits than its factorization.

19842459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5627 (or 5614 counting only the distinct ones).

The product of its digits is 103680, while the sum is 42.

The square root of 19842459 is about 4454.4875126102. The cubic root of 19842459 is about 270.7271619400.

It can be divided in two parts, 19842 and 459, that added together give a triangular number (20301 = T₂₀₁).

The spelling of 19842459 in words is "nineteen million, eight hundred forty-two thousand, four hundred fifty-nine".